[issue20604] Missing invalid mode in error message of socket.makefile.

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thank you for your patch Franck. But it would be more useful to output all mode argument, not only wrong character. And it should be wrapped in a tuple to prevent subtle formatting error.

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nosy: +serhiy.storchaka
versions: +Python 3.5 -Python 3.3

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<http://bugs.python.org/issue20604>
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